159 lines
4.3 KiB
Markdown
159 lines
4.3 KiB
Markdown
---
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layout: post
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title: "Systemd on raspbian"
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date: 2012-09-19 17:16
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comments: true
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categories:
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- systemd
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- raspberry pie
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- raspbian
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---
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As I like the stability and raw speed of systemd, I wanted to leave debian's
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init system behind and switch to systemd.
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The basic installation is pretty easy:
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$ apt-get install systemd
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Then you need to tell the kernel to use systemd as the init system:
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To do so, append `init=/bin/systemd` to the end of `/boot/cmdline.txt` line
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$ cat /boot/cmdline.txt
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dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait init=/bin/systemd
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If you reboot, systemd will be used instead of the default init script.
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Currently debians version of systemd doesn't ship many service files by default. Systemd
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will automaticly fallback to the lsb script, if a service file for a deamon is
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missing. So the speedup isn't as big as on other distributions such as archlinux
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or fedora, which provide a deeper integration.
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To get a quick overview, which services are started nativly, type the following command:
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$ systemctl list-units
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All descriptions containing `LSB: ` are launched through lsb scripts.
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Writing your own service files, is straight forward. If you add custom service
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files, put them in /etc/systemd/system, so they will not get overwritten by
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updates.
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To get further information about systemd, I recommend the [great archlinux wiki article](https://wiki.archlinux.org/index.php/Systemd).
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At the end of this article, I provide some basic one, I use. I port them over mostly from archlinux.
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In the most cases, i just have adjusted the path of the binary to get them working. (from /usr/bin to /usr/sbin for ex.)
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It is important, that the service name match with the initscript, so it will be used instead by systemd.
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This will not work in all cases like dhcpcd which contains the specific network device (like dhcpcd@eth0). In this case, you have to remove origin service with `update-rc.d` and enable the service file with `systemctl enable`.
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Also avaible as [gist](https://gist.github.com/ac8ab2e84125ededa5c5):
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``` plain /etc/systemd/system/dhcpcd@.service
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# IMPORTANT: only works with dhcpcd5 not the old dhcpcd3!
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[Unit]
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Description=dhcpcd on %I
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Wants=network.target
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Before=network.target
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[Service]
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Type=forking
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PIDFile=/run/dhcpcd-%I.pid
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ExecStart=/sbin/dhcpcd -A -q -w %I
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ExecStop=/sbin/dhcpcd -k %I
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[Install]
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Alias=multi-user.target.wants/dhcpcd@eth0.service
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```
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``` plain /etc/systemd/system/monit.service
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[Unit]
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Description=Pro-active monitoring utility for unix systems
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After=network.target
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[Service]
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Type=simple
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ExecStart=/usr/bin/monit -I
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ExecStop=/usr/bin/monit quit
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ExecReload=/usr/bin/monit reload
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[Install]
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WantedBy=multi-user.target
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```
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``` plain /etc/systemd/system/ntp.service
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[Unit]
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Description=Network Time Service
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After=network.target nss-lookup.target
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[Service]
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Type=forking
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PrivateTmp=true
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ExecStart=/usr/sbin/ntpd -g -u ntp:ntp
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ControlGroup=cpu:/
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[Install]
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WantedBy=multi-user.target
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```
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``` plain /etc/systemd/system/sshdgenkeys.service
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[Unit]
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Description=SSH Key Generation
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ConditionPathExists=|!/etc/ssh/ssh_host_key
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ConditionPathExists=|!/etc/ssh/ssh_host_key.pub
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ConditionPathExists=|!/etc/ssh/ssh_host_ecdsa_key
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ConditionPathExists=|!/etc/ssh/ssh_host_ecdsa_key.pub
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ConditionPathExists=|!/etc/ssh/ssh_host_dsa_key
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ConditionPathExists=|!/etc/ssh/ssh_host_dsa_key.pub
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ConditionPathExists=|!/etc/ssh/ssh_host_rsa_key
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ConditionPathExists=|!/etc/ssh/ssh_host_rsa_key.pub
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[Service]
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ExecStart=/usr/bin/ssh-keygen -A
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Type=oneshot
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RemainAfterExit=yes
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[Install]
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WantedBy=multi-user.target
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```
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``` plain /etc/systemd/system/ssh.socket
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[Unit]
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Conflicts=ssh.service
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[Socket]
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ListenStream=22
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Accept=yes
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[Install]
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WantedBy=sockets.target
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```
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``` plain /etc/systemd/system/ssh@.service
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[Unit]
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Description=SSH Per-Connection Server
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Requires=sshdgenkeys.service
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After=syslog.target
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After=sshdgenkeys.service
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[Service]
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ExecStartPre=/bin/mkdir -m700 -p /var/run/sshd
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ExecStart=-/usr/sbin/sshd -i
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ExecReload=/bin/kill -HUP $MAINPID
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StandardInput=socket
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```
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``` plain /etc/systemd/system/ifplugd@.service
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[Unit]
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Description=Daemon which acts upon network cable insertion/removal
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[Service]
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Type=forking
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PIDFile=/run/ifplugd.%i.pid
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ExecStart=/usr/sbin/ifplugd %i
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SuccessExitStatus=0 1 2
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[Install]
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WantedBy=multi-user.target
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```
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